| 引用本文: | 甘国渝,陈曦,朱海, 等..水热耦合对不同土地利用类型土壤磷生物有效性的影响[J].灌溉排水学报,2022,41(4):58-66. |
| GAN Guoyu,CHEN Xi,ZHU Hai, et al.水热耦合对不同土地利用类型土壤磷生物有效性的影响[J].灌溉排水学报,2022,41(4):58-66. |
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| 摘要: |
| 【目的】研究水分、温度及其耦合效应对不同土地利用类型的土壤磷素组分及土壤有效磷（Olsen-P）量的影响。【方法】采用室内培养试验，以稻田、旱地、菜地和林地4类土地利用类型的土壤为研究对象，设定3个水分（W）梯度：40%、70%和100%的土壤质量含水率，分别记为W40、W70和W100；3个温度（T）梯度：15、25 ℃和35 ℃，分别记为T15、T25和T35，进行连续15 d的水分和温度二因素培养试验。根据土壤磷生物有效性的分级方法（Biologically-based P，BBP）对各处理土壤进行磷的分级和测定。【结果】同一温度和水分条件下，稻田、旱地、菜地和林地的土壤生物有效性磷量及Olsen-P量从高到低依次为林地>菜地>旱地>稻田。温度恒定时，土壤水分与4类土壤中HCl-P、Citrate-P、Enzyme-P和Olsen-P量呈极显著正相关。土壤水分恒定时，温度与4类土壤中HCl-P量和Olsen-P量呈极显著正相关，与Citrate-P量呈显著负相关，而与Enzyme-P量无明显相关性，但Enzyme-P量在35 ℃达到最高值。稻田、旱地、菜地和林地土壤中Olsen-P量与HCl-P量和Enzyme-P量呈正相关，与Citrate-P量和CaCl2-P量呈负相关。【结论】增加土壤含水率可提高各类土壤中HCl-P、Citrate-P、Enzyme-P量和Olsen-P量；增加土壤温度有助于提高HCl-P量和Olsen-P量、降低Citrate-P量。稻田、旱地、菜地和林地土壤中的CaCl2-P量、菜地中的Enzyme-P量受水热交互效应显著。在一定土壤温度和水分范围内，温度和水分在不同类型土壤磷生物有效性组分上具有正向耦合效应，并显著影响土壤的供磷水平和能力。 |
| 关键词: 土壤磷；水分；温度；生物有效性；耦合效应 |
| DOI：10.13522/j.cnki.ggps.2021520 |
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| Hydrothermal Effects on Phosphorus Bioavailability in Different Soils |
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GAN Guoyu, CHEN Xi, ZHU Hai, et al
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(College of Agriculture, Yangtze University/Engineering Research Center of Ecology and
Agricultural Use of Wetland, Ministry of Education, Jingzhou 434025, China)
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| Abstract: |
| 【Background】Nutrient cycling and kinetic in soil is mediated by biogeochemical processes which in turn is modulated by soil water and temperature. The aim of this paper is to investigate the hydrothermal effects on bioavailability of phosphorus (P) in different soils. 【Method】We studied soils with different cultivations using culture experiments: paddy field, upland, vegetable and forest in the same region. There were three moisture treatments for each soil by keeping the soil water content at 40% (W40), 70% (W70) and 100% (W100) of the saturated water content, respectively. For each soil water, there were further three temperature treatments by keeping the soil temperature at 15 ℃ (T15), 25 ℃(T25) and 35 ℃(T35), respectively. All soils were incubated for 15 days, after which we measured the contents of P in different forms.【Result】When temperature and soil moisture were the same, the contents of bioavailable P and Olsen-P in different soils were ranked in the order of forest > vegetable > upland > paddy field. When the temperature was the same, soil water content up-regulated HCl-P, Citrate-P, Enzyme-P and Olsen-P, regardless of the soils. When soil moisture content was the same, the temperature positively impacted HCl-P and Olsen-P, negatively affected Citrate-P (p<0.01), and had no significant correlation with enzyme-P despite enzyme-P peaking at 35 ℃. The content of Olsen-P in all soils was positively correlated with the content of HCl-P and Enzyme-P, and negatively correlated with the content of Citrate-P and CaCl2-P. The analysis of variance showed significant difference in interaction between phosphorus with temperature and moisture- temperature combination between the soils, and the effect was ranked in the order of temperature > moisture > temperature -moisture coupling.【Conclusion】Increasing soil moisture increased HCl-P, Citrate-P, Enzyme-P and Olsen-P in all soils. Increasing soil temperature increased HCl-P and Olsen-P, while reducing Citrate-P. Among all P forms we measure, only CaCl2-P and Enzyme-P were jointly affected by soil water and temperature. In a certain range, the effects of temperature and moisture on bioavailability of different P forms are integrative in all four soils we studied. |
| Key words: soil phosphorus; soil moisture; temperature; P bioavailability; hydrothermal effect |
